If the oil return passages are blocked and the piston rings are worn, what is the likely outcome in a diesel engine?
Excessive oil consumption
The oil control ring and the oil return passages together scrape oil from the cylinder wall and drain it back to the sump, keeping oil out of the combustion chamber.
If the piston rings are worn, they can no longer wipe the cylinder wall properly, so oil slips past into the combustion space where it is burnt.
If the oil return passages are also blocked, scraped oil cannot drain back and instead accumulates and is drawn up past the rings, adding to the oil that reaches the combustion chamber.
The combined effect is that oil is continuously burnt along with the fuel, so the engine loses oil rapidly.
Hence, the answer is Excessive oil consumption.
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